Presented here is a method for preparing small DNA arrays on aldehyde-bearing glass
slides. Immobilization involves reductive amination and employs oligonucleotides with
3′-terminal lysine residues, obtained in high yield from solid phase syntheses. Spot
patterns are produced by protecting selected areas of the aldehyde slides with wax,
coating the free surface with a methyl triethylene glycol derivative, and removing
the wax with dichloromethane. The DNA arrays give better signal to noise ratios in
hybridization experiments than slides without passified background.
oligonucleotides - Schiff bases - solid phase synthesis - DNA - molecular recognition